Rolla is a city in Phelps County, Missouri, United States, midway between the larger cities of St. Louis and Springfield along I-44. It is the county seat of Phelps County. The Rolla Micropolitan Statistical Area consists of Phelps County. Rolla is an important center for state and federal education and research in science and technology. It is the home of the Missouri University of Science and Technology,the National Geospatial Technical Operations Center III, the Missouri Water Science Center, the Mid-Continent Geographic Science Center, National Spatial Data Infrastructure Partnership Office Liaisons, and the Rolla Science Information and Library Services office. The headquarters of the Mark Twain National Forest, the only United States National Forest in Missouri, is also located in Rolla.